Notice FOCAL SERIE KX
Extrait du mode d'emploi FOCAL SERIE KX
Les instructions détaillées pour l'utilisation figurent dans le Guide de l'utilisateur.
I, J). "Quad amping" can be included, with 4x separate amplifiers, offering identical specifications. The impedance load will be approximately 1 ohms (fig. Again, each amplifier power and load rating must be compatible for 1 ohms nominal impedance. Cut-off frequency Generally, it is accepted the frequency scale is from 60 to 100Hz, depending on many parameters (cabinet loading, exterior load of vehicle interior etc, etc). If in doubt, we recommend a cut-off frequency of approximately 80Hz be selected. Too high a cut off frequency and the "staging" will be uneven. The bass frequencies will become directional. Too low a cut-off frequency and the general performance maybe reduced. Finally a process of "trial and error" can be used to define this aspect, for maximum enjoyment of your K2 Power KX series subwoofers. The 46 KX 4 subwoofer has been developed exclusively to work in bass reflex enclosures. Due to the large surface area available, with high strength multi-ferrite motor structure, together producing high efficiency necessary for dynamic power SPL installations. Any bass reflex enclosure uses an acoustic suspension or spring, in the form of a port. The port whether a tube, or slot must be correctly calculated, concerning area and length to the volume chosen. The air that passes through the port is effectively the spring and pressure load on the subwoofer diaphragm. To reduce air whistling, the port should remain smooth internally, with maximum aerodynamic characteristics applied throughout. For a port-tube application, it is advised to use the maximum diameter possible corresponding to the appropriate length; this will further reduce wind turbulence. The enclosure structure should be strong and rigid throughout, not only due to the weight of the 46 KX 4, but notably for the amount of air pressure displacement produced from the diaphragm movement. 13 English 27 KX Sealed enclosure 20 liters (0. 71 cu. ) F - 3 = 48Hz / Fast and tight bass 30 liters (1. 06 cu. ) F - 3 = 45Hz / Punchy and dynamic bass 40 liters (1. 41 cu. ) F - 3 = 44Hz / Deep and articulate bass 33 KX Sealed enclosure 30 liters (1. 06 cu. ) F - 3 = 42Hz / Fast and tight bass 40 liters (1. 41 cu. ) F - 3 = 41Hz / Punchy and dynamic bass 50 liters (1. 77 cu. ) F - 3 = 40Hz / Deep and articulate bass SPL (dB) 1W/1m L Frequency (Hz) M SPL (dB) 1W/1m Frequency (Hz) 40 KX Sealed enclosure 40 liters (1. 41 cu. [...] Ensure it is compatible with a 4 ohms impedance load. 11 English F Connecting in parallel: 0. 25 ohm G Connecting in: series / parallel connection: 1 ohm H Connecting in series: 4 ohms I Double connection in parallel: 2x0. 5 ohm English 12 J Double connection in serie: 2x2 ohms K 4 amplifiers connected: 4x1 ohm Installation Connections 46 KX 4 Choosing the correct enclosure or acoustic load (general) The correct acoustic load, normally the type of enclosure and volume made available to the subwoofer, is of prime importance for maximum performance. All pistonic acoustic devices (in this case subwoofers) require a defined acoustic load to work correctly. This means the type of charge (sealed or bass reflex) and volume (litres / cubic ft) must be chosen wisely, to gain maximum performance. Never choose "any" ready prepared subwoofer enclosure. They may accept your subwoofer, concerning the hole cut-out size for chassis, but do they match the volume or type of charge as defined in the subwoofer parameters? Sealed / closed box enclosure All K2 Power subwoofers (except the 46 KX 4) have been carefully optimised to work in sealed or closed box enclosures. This type of enclosure ensures sub bass frequencies remain full and controlled. The available excursion of the sub is far more stable, for controlled linearity limiting distortion, ensuring maximum performance is maintained. The added benefit of a properly defined sealed enclosure, is that it remains comparatively small in size. Compared to a defined bass reflex enclosure, which normally has a slight increase in the sound pressure level, K2 Power subwoofers have improved power handling characteristics. Therefore this slight reduction of level can be compensated, with increased amplification. Bass-reflex enclosure The mighty 46 KX 4 subwoofer incorporates a unique feature, consisting of 4 individual wound voice coils, intertwined together on the same vented aluminium former. Each voice coil winding has an impedance of 1 ohm, giving greater flexibility. Note that core section of connecting cables and complete amplifier compatibility must be verified before, for load ratings from 0. 25, 1 or 4ohms (fig. F, G, H). "Bi-amping" can also be included for the 46 KX 4. Thus load impedance's of 2x0. [...]..
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